AWS Improvements Thoughts

Things that may help improve our AWS setup

1. Spread our scanning instances across availability zones. Instances in separate AZs can't be on the same underlying hardware. NOTE: Instances live in subnets and subnets are tied to a particular AZ, so to accomplish this, we will need to create a scanner subnet in each AZ.
2. Change the tenancy of our scanning instances so we have the entire underlying hardware and don't have to compete with other parties for connections/connection table resources.